Hmm, sounds like an odd duck. Components might not help you date it as there's no way to know what's original. Still, the lack of Nervex lugs and that cottered steel crankset (which the Super Course ditched after '73, I believe) is odd. Plus the '75 Worksop serial number?! On the other hand, some odd things did come out of the Raleigh factories in the 1970s!